Centrifugal countergravity casting
First Claim
1. A method of countergravity casting a plurality of articles, comprising:
- providing a ceramic mold having an upstanding riser passage and a plurality of mold cavities disposed along a length of said riser passage at different elevations, each mold cavity communicating to said riser passage via a gate passage, causing molten metal to flow upwardly from a source into said riser passage for supply to said mold cavities via their gate passages, rotating said mold so that molten metal that resides in said gate passages is subjected to centrifugal force in a direction toward said mold cavities, draining molten metal from said riser passage before molten metal in said mold cavities and said gate passages solidifies, leaving said gate passages at least partially filled with molten metal for supply to said mold cavities in response to shrinkage as molten metal therein solidifies while said mold is rotated, and solidifying molten metal in said mold cavities while rotating said mold to form a plurality of individual solidified cast articles in said mold cavities.
1 Assignment
0 Petitions
Accused Products
Abstract
Method and apparatus for countergravity casting a plurality of articles wherein a ceramic mold is provided having an upstanding riser passage and a plurality of mold cavities disposed along a length of the riser passage at different elevations, each mold cavity communicating to the riser passage via a gate passage, wherein molten metal is forced to flow upwardly from a source into the riser passage for supply to the mold cavities via their gate passages, wherein the mold is rotated so that molten metal that resides in the gate passages is subjected to centrifugal force in a direction toward the mold cavities, and wherein molten metal in the riser passage is drained to empty the riser passage before molten metal in the mold cavities and the gate passages solidifies, leaving the gate passages at least partially filled with molten metal for supply to the mold cavities in response to shrinkage as molten metal therein solidifies while the container is rotated. The molten metal in the mold cavities is solidified while rotating the container to form a plurality of individual solidified cast articles in the mold cavities.
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Citations
23 Claims
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1. A method of countergravity casting a plurality of articles, comprising:
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providing a ceramic mold having an upstanding riser passage and a plurality of mold cavities disposed along a length of said riser passage at different elevations, each mold cavity communicating to said riser passage via a gate passage, causing molten metal to flow upwardly from a source into said riser passage for supply to said mold cavities via their gate passages, rotating said mold so that molten metal that resides in said gate passages is subjected to centrifugal force in a direction toward said mold cavities, draining molten metal from said riser passage before molten metal in said mold cavities and said gate passages solidifies, leaving said gate passages at least partially filled with molten metal for supply to said mold cavities in response to shrinkage as molten metal therein solidifies while said mold is rotated, and solidifying molten metal in said mold cavities while rotating said mold to form a plurality of individual solidified cast articles in said mold cavities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of countergravity casting a plurality of articles, comprising:
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providing a ceramic mold having an upstanding riser passage and a plurality of mold cavities disposed along a length of said riser passage at different elevations, each mold.cavity communicating to said riser passage via a gate passage, immersing a fill tube communicated to said riser passage in a pool of molten metal, establishing a subambient pressure in a container in which said mold is disposed with a particulate medium about said mold in said container to cause the molten metal to flow upwardly into said riser passage for supply to said mold cavities via their gate passages, rotating said container with said mold disposed therein while said fill tube is immersed in said pool so that molten metal that resides in said gate passages is subjected to centrifugal force in a direction toward said mold cavities, and draining molten metal from said riser passage before molten metal in said mold cavities and said.gate passages solidifies so as to leave said sprue passage empty proximate said gate passages and to leave said gate passages at least partially filled with molten metal for supply to said mold cavities in response to shrinkage as molten metal therein solidifies while said container and said mold are rotated, withdrawing said fill tube from said pool while rotating said container and said mold, and solidifying molten metal in said mold cavities while rotating said container and said mold to form a plurality of individual solidified cast articles in said mold cavities. - View Dependent Claims (15)
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16. A method of countergravity casting a plurality of articles, comprising:
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providing a fugitive pattern having an upstanding riser passage-forming portion and a plurality of mold cavity-forming portions disposed along a length of said riser-passage-forming portion, each mold cavity-forming portion being connected to said riser passage-forming portion via an gate passage-forming portion, a particulate medium disposed about said pattern in a container, causing molten metal to flow upwardly from a source into said riser passage-forming portion for supply to said mold cavity-forming portions via their gate passage-forming portions, rotating said container and said pattern so that molten metal that resides in said gate passage-forming portions is subjected to centrifugal force in a direction toward said mold cavity-forming portions, draining molten metal from a, riser passage formed by destruction of said riser passage-forming portion before molten metal in mold cavities and gate passages formed by destruction of said mold cavity-forming portions and said gate passage-forming portions solidifies so as to leave said gate passages at least partially filled with molten metal for supply to said mold cavities in response to shrinkage as molten metal therein solidifies while said container is rotated, and solidifying molten metal in said mold cavities while rotating said container to form a plurality of individual solidified cast articles in said mold cavities. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification